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H. D. RICE. MACHINE FOR MAKING SHEET METAL PIPES.

No. 484,112. Patented Oct. 11, 1892.

UNITED STATES PATENT OFFICE.

HARVEY D. RICE, OF BROOKLYN, ASSIGNOR TO THE ABENDROTH & ROOTMANUFACTURING COMPANY, OF NEW YORK, N. Y.

MACHINE FOR MAKING SHEET-METAL PIPES.

SPECIFICATION forming part of Letters Patent No. 484,112, dated October11, 1892.

Application filed March 16, 1892.

To all whom it may concern.-

Be it known that I, HARVEY D. RICE, of Brooklyn, Kings county, and Stateof New York, have invented a certain new and useful Improvement inMachines for Making Sheet-Metal Pipes, of which the following is aspecification.

This invention relates to machines for making sheet-metal pipes in whicha sheet or strip of metal is wound spirally and has the lapped edgessecured together by rivets; and it consists in the construction andnovel arrangement of parts, as hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation of a deviceembodying my improvement. Fig. 2 is a transverse section thereof. Fig. 3is a top view. Fig. 4. is a 'perspective view of a certain part.

Similar letters of reference designate corresponding parts in all thefigures.

Referring by letter to the drawings, A des ignates a hollow mandrel uponwhich a sheet or strip of metal A is spirally wound to form a pipe ortube.

B designates a formerhavin g its interiorconforming to the shape of themandrel and the pipe thereon and adapted to surround the pipe and pressit closely on the mandrel as the metal is fed along. This former isprovided with a hole I) for the passage of the punch b, and the mandrelA is also provided with a hole a to receive the end of the punch andallow the punched-out pieces of metal to fall into the mandrel. Theholes a are punched through the lapped edges of the metal, and rivets aare subsequently placed therein. It is found that in machines of thischaracter the former B wears away on its interior surface quite rapidly.I therefore pro- Serial No. 425,110. (No model.)

vide means for adjusting the former. As here shown, the former is splittransversely, as at b and the opposite sections have outwardly-extendingjaws b which are perforated for the passage of clamping-bolts b Betweenthe jaws b I introduce one or more shims b These-shims may be of hardwood, and as the interior of the former wears away the shim or shims areto be substituted by thinner ones, so that the diameter of the formermay be reduced by manipulating the clampingscrews. As before stated, theformer or holder wears away quite rapidly, and it is necessary that theholder should fit quite snugly around the pipe material.

Having described my invention, what I claim is- 1. In a machine formaking pipes of strip metal, the combination, with a mandrel and apunch, of a tubular former on the mandrel and having means for adjustingits inner diameter, said mandrel and former having registering openingsto receive the punch, substantially as specified.

2. In a machine for making strip-metal pipes, the combination, with amandrel and a punch, of the former split transversely and having theoutwardly-extending jaws, a shim between said jaws, and clamping means,the said mandrel and former having registering openings to receive thepunch, substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' HARVEY D. RICE.

Witnesses:

GEO. W. PAYNTAR, JAMES CUMMINGS.

